The following data represent the means for each treatment condition in a two factor experiment. Note that one mean is not given. What value for the missing mean would result in no AxB interaction?                               B1             B2 ​ A1 ​ 20 ​ 30 ​ A2 ​ 10 ​ ? a. 10​ ​b. 20 ​c. 30 ​d. 40

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